Currently, vcfanno annotates the VCF's with two fields (CLNSIG and CLNREVSTAT) taken directly from the ClinVar VCF and an additional field called "clinvar_sig" which is post annotated and its value depends on the value of CLNSIG.
In ClinVar VCF files from 2016, the CLNSIG column had a numeric datatype where 0 denoted 'uncertain', 2 denoted 'benign', 5 was 'pathogenic', 255 was 'other' and so on. In this situation, we would use the postannotation block to add an additional column called "clinvar_sig" containing relevant descriptions of the numbers in CLNSIG
However, in the latest ClinVar VCF files the CLNSIG column contains the pathogenicity status instead of the numbers. Therefore, we no longer require this postannotation block and the additional "clinvar_sig" column